Uptake and localisation of lead in the root system of Brassica juncea

Donald E R Meyers; G J Auchterlonie; R I Webb; B Wood

doi:10.1016/j.envpol.2007.08.029

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Uptake and localisation of lead in the root system of Brassica juncea

Journal article

Peer reviewed

Uptake and localisation of lead in the root system of Brassica juncea

Donald E R Meyers, G J Auchterlonie, R I Webb and B Wood

Environmental Pollution, Vol.153(2), pp.323-332

2008

DOI: https://doi.org/10.1016/j.envpol.2007.08.029

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Abstract

Brassica juncea

Pb uptake

rhizofiltration

ultrastructural localisation

The uptake and distribution of Pb sequestered by hydroponically grown (14 days growth) Brassica juncea (3 days exposure; Pb activities 3.2, 32 and 217 μM) was investigated. Lead uptake was restricted largely to root tissue. Examination using scanning transmission electron microscopy-energy dispersive spectroscopy revealed substantial and predominantly intracellular uptake at the root tip. Endocytosis of Pb at the plasma membrane was not observed. A membrane transport protein may therefore be involved. In contrast, endocytosis of Pb into a subset of vacuoles was observed, resulting in the formation of dense Pb aggregates. Sparse and predominantly extracellular uptake occurred at some distance from the root tip. X-ray photoelectron spectroscopy confirmed that the Pb concentration was greater in root tips. Heavy metal rhizofiltration using B. juncea might therefore be improved by breeding plants with profusely branching roots. Uptake enhancement using genetic engineering techniques would benefit from investigation of plasma membrane transport mechanisms. The sites of Pb sequestration within the root system of hydroponically grown Brassica juncea were identified.

Details

Title: Uptake and localisation of lead in the root system of Brassica juncea
Authors: Donald E R Meyers (Author) - University of the Sunshine Coast - Faculty of Science, Health and Education
G J Auchterlonie (Author) - University of Queensland
R I Webb (Author) - University of Queensland
B Wood (Author) - University of Queensland
Publication details: Environmental Pollution, Vol.153(2), pp.323-332
Publisher: Pergamon
Date published: 2008
DOI: 10.1016/j.envpol.2007.08.029
ISSN: 0269-7491
Organisation Unit: University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99450206602621
Output Type: Journal article

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